Truthfully, they never quite seemed to be the best of friends.
But that hasn't stopped Floyd Mayweather from paying a rather significant tribute to his rival Conor McGregor.
Yes, Mr Mayweather has stuck up a two-and-a-half metre tall portrait of the Dubliner on the wall of his brand-new, sprawling abode.
The boxer bought the €16million mansion in California recently and showed off the art in an Instagram snap posted on Tuesday.
"Exclusive timeless artwork in my Beverly Hills home," he wrote in the accompanying caption.
The work is made from glass pieces and was produced by Tiffanie Anderson – who goes by The Pretty Artist on Twitter. She has been commissioned previously to create pieces for Floyd – including an image of him fighting Manny Pacquiao in 2015.
Mr Mayweather bought his impression French-style property earlier this year. It was built in 1992 but extensively renovated two years ago, according to the LA Times.
Spread over 1,400 sq metres and two storeys, features include a chef’s kitchen, a library, a family room and a cocktail bar. There is also a guesthouse, a pool house, a gym, a four-car garage, and a 20-person theatre.
Of course, the 40-year-old defeated Conor McGregor, 29, in a super-welterweight bout held in Las Vegas last month.
The undefeated fighter has held more than a dozen world titles in five weight classes and has banked an estimated €675million over the course of his career.
He owns further properties in Las Vegas and Miami.